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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1572f74dd7e76a330ed3b7a2c1b8ec3fb8a30b0997fe0cfe05143f54e59df154' 
  AND token = 'NiHtPmtyWXYR+mSxIqCH3v2rp87dQc3ORwEuq7qGxss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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