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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b1c14f101dd3b907fddf70f87d147c31343d69b6f8734ca04f2f8386b9bc0d' 
  AND token = '8Kxd62gGlbvpXDkRpogebCBErp+uTUw2Ue8WRHwmhHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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