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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d1a07f699d9e6c237c45af2791c7c802c4fe0840a38cb26cc68d48ac8ce0bb' 
  AND token = 'zbaK06oINQZWUw5rTSkHH2p6uI6f+mt8jjBYudy44Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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