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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabbffe4bccb16284f5998f62a995d89160aad388bd3e7023367732ba17abb16' 
  AND token = 'gj6P48Yzm02XMDDsSNVozzDttUv46EIECQIu5FjMEdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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