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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4bcf699dd69cd2ca404296d6a8f5d2f8cbf787b1798981e9885db30233bf18' 
  AND token = 'kKzLDmuz5hLDcIk451eVVtqJZNO76q6cC+RQWk1TriU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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