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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73abff157e72eebe371ce320e2f1b32418f0157b77c6316d30e9707fe12197f3' 
  AND token = 'q27ackiYfE9G2dqKZ+3Gwvo2qK6gvcbBfk1w84bKElU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00183

JSON explain

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