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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd663366739fc5303eb85ffd4dc8a9ce270ec93b8daedda569f4a73ca2e22079d' 
  AND token = 'G7bQTk3QdNld/KjX58xJlNqbtQ+Ofr7OCyFiXS0eUEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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