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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e3f051b1dbcaf6eda0cf17df8083ff404bd379f8b3656655d78a8d6c6bea86' 
  AND token = 'nuX/idfAw/cu8LdOtb/04YCgdlS6q4uJsUmZXw9Lj9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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