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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d54c8475c92fd1192ab1532a08a8b9897a60250c9223e27170fb3f5dc097ad3' 
  AND token = 'p2mcYgc1bDKvTnWbx5mTnntE4u2koeqvyj8LTZfXQvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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