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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60df9ac29164b48b516824f0e088ab45835ef5ba9534fb7833adf6f54582507c' 
  AND token = '6KRceob6oMt8V2BMbs4NiMULodLzJAgXHJcfALU3OLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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