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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9758c4ae51eb402f03de2d2662953f3223e69e1e329e6797bbfa202c0b0a634' 
  AND token = 'CofyncZ1EyhOCXNoG0003zwlCuvvPvHhySHVG9vi/H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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