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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126038bd90a49d1e4a4d18ed66a45151d32b4ea5f525691cbe58964c0556841c' 
  AND token = 'y5AEB2bYpYHmKRDSdTWtdeXPUABIGn30d/jwRbiY2xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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