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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74ce638a68596b242403dee0ee23b635ab3f020d2974a45a47fdd997257d6c8' 
  AND token = '+Al2UAeQ892m50jhV58/FYtlQdRov3dh1FQgS2muzEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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