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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a99ba6e6620d30650c696caa9943d00bf09a2cbfd0feb2f533074bd49f75c6' 
  AND token = 'hK77Isky6lrj9XMK0BR5bp2gR5MUy6HkeUuUTQoWQ0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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