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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea772c6e1b1e1575ac7de3ed2676994d11017092181ff4e1fec1d11ff6b98ab8' 
  AND token = '705wRxXrnJMb5tXZ6rMUOt+37mhSb3u4Y5aeFmIUM0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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