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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86dab00ef12248bbf169a225eb7343922ca833029d4421e7733597367649b2d' 
  AND token = 'is7XOx2q8nNxdAGy1NI149rRgccvg+8Gw13KOJS6vIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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