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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47468e25d316321e00aa63f73776f9a4f3412594b2f365925191dd92d7853d8a' 
  AND token = '4KXe3FhSYik2jNEzuuzboDUTzAk18Fh8MyBz3zXIekY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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