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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9c6ffb90704a7df82ee9e6431c7a691f4badb18dc59275a28f24854198788e' 
  AND token = 'czxlbaA0NraTp3ozDytVRKbEZh8ZZcc5VlPAR7mpbfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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