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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce30daf0a947c4aced6b1dcc32277417638675285bf7affb33a1d77a56acdbde' 
  AND token = '5FkFs+2rmmQe0Dk+ckd5AClXcGW9tah65XfRL3gYxrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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