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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dca8e581c174f1afc9241d81674efc2f0213e98dd104bbbecd042f07ac7f36' 
  AND token = 'oYgx88vygX64FChnPBjnU1y9ckWOyQaAwGHQyREmiKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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