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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c9f03fc992fd5153437c1e3e2d7e24ef4ee03cf9cf7435ba37642b5dbc56b6' 
  AND token = 'nQXNZxVs+iRrxTtrS6nXkrw6ZGLrqOoqz8NlMeW90Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}