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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477f23b26d8795f9f1ff6c5cffc137bac78c4f6f45806f770abf312cfc0df9d0' 
  AND token = 'c2jhmsxXOKqOEccFRHmljGBqE2MchU5pgv7BeSglEec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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