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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38fc0a5650ab6154762232845b38a813a76bca2114892320af13d33ec85fee2' 
  AND token = 'n5ld16ZOZYvLHS+GTkUkS3Dqyvjnj9BlAsjLOYRjUrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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