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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea23f0680936c95ade65194e9e343d97a3aa443269498b46a0dd9987aaab764a' 
  AND token = 'g6Yab/15vm34URQEeDn5GIFltH890JxveHnixKSNxoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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