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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8d07e63577e3d3d6b6a95d5fc70a874a7280f885f528b0336221a03d88a39a' 
  AND token = 'nQv2NuYejgHOO9dLHv2JWmTjJuRJJWjMj6Ic+Jscl3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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