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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c45a39b542a7ff962226bda29179bf74421d12c5d7d43220aad248386272a52' 
  AND token = '8gqX0Zgj6dr2PPiA4Six26naOnfA9HWjrLL4aa8Woow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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