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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b134cf17afa6a2e2a1e1fc430672f97603ac97e2c3b11f3c672e3f975d7611' 
  AND token = 'JhMm+UNMjzbex7ohgfwYKWGEThKTQi+dv5t+X3X1VtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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