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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930106f338ae580a8469a3a9d35525af51bfeff75bd64fd2f1360a0e55b17ca0' 
  AND token = 'fxoYVP5L/2mOx6lecTeLubYv8sr8xQ1IxTpPHOeS8nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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