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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731e3ad00b3f5368f080e254933a5f53d7a88bb007929649060aa592592f0df0' 
  AND token = '9xJ9K6IdZ5KpKNH09lhl8Dy037zmR4QM9tqcIF3zmsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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