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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237c34881f49fbb6661342220750e04eb38ea9eff659e99aa7b71db28f3fa722' 
  AND token = 'qRnUPV0etPLbbq9cDKOithrxmZsSotE4d7ky3xUdO9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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