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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4d536246e13d81d088886a8e7ea2094e392a6bb1c14c8443aeedb5af893883' 
  AND token = '30M+yMtL8twKQQC4evzpT4JDHjpa1imsPcukyf1Bhy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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