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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca16aeab1ad96cdbf1c160a2371fd7b007136a7cbdabb137e88f3dd8004f3eb9' 
  AND token = 'CfJud0xHN3IL+l7BID/6FxnX7P8AUK0kJ9lBstEBLlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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