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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cf96480f1160febc58c6b2a3cc37a24f5d8fd8b44825c69d49319efa724ad8' 
  AND token = 'hRJerwn9c9oy6iAPK9eUKURsNniPlJ9bq92F0Iujqx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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