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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7794211d20af5c870e093a23d9e1174e18eeccbb087db3572f40a77910d608' 
  AND token = 'xWVEjRG3RRxZuV2LFgSbGFRlA85kESRFTuTCMuQ04+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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