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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f79b286b112c4f039103c037325cbef8e2740cd9b2536d798094aa8f3a0173' 
  AND token = '8T+MSwUmzsWAFOn3/ihg0cGAcExGl3TIrBzE8zJcwa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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