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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03da8d575d8f369bbff1b9ec7cd513a62793c067df8f118b528e403570d5afd1' 
  AND token = '1BokqCf+5dFf4q5ySrpo/Y9bBKLilU6GrZc74+5kHuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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