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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b915f39de9448d921fb0ed4fe1e22f2ff0d8ca66a2c41a2fbe930ef8e4cfb6d7' 
  AND token = 'AxRYy4t/Rg2XwkGS7OsZp8IyQNorHfdm2daF4cQa/Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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