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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dacce029f75f3f258937f117578699fdac2efae38450c92e3efb7b047c9821f' 
  AND token = 'ejbOwEWC9thvAFL4CNuj4htRcIqdlC81Ue8y3zL3YR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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