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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302e45d8a181d25af98e281a52f48deebc38b95699ff44f2a634ecc71d93162a' 
  AND token = 'i7Bdx+dnS7zTow+Gt8/ikihZBCBuMdimX3EYUV9VSmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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