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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0aafe7c2a78da576340edbebfba48d38dde6e3650456e5c2fbe24e8c11b915' 
  AND token = 'u0gf9M+M8PvGpt50ciVj77/XazA+xivwu/YT/tGop1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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