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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8968477699495b0d220a13f29f79e0a4d795b4232d97660c23e6b8147d13a1fc' 
  AND token = '9MzCLyKlclmf9O9487JWEX+e5fcoULUqPKoRzcU4erg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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