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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23774fbe2d55f19f62ad769e7db22a040ef6a1e24d8781a75629597be017894f' 
  AND token = '9dPcgGARlnQx9v0rYFb7MFafCudyg/MQ3gb1u9Go5jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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