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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc47f28b9975791a5e7bc161ceeb54813f938dbec6bf5618e33a553c11e5bb09' 
  AND token = 'c9WuQ23sewMEXJOfYFlBZcanKMF6+zmr9N3xl3pMN+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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