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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f632d67d6f1a2981ea3ef516ac240105b62f22ecf3afd354b3ee304b22556d' 
  AND token = 'ynowzXQa5d61BXm0Zx6SqYDSDqnx4qhDMbVO8s4IFTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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