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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dece6b0cbc34308d84f83f193ec9047a9e3697068308b905bd10661151ea5a8c' 
  AND token = 'qfuTMnuo6JrXAXOBwa7/phHJtFgf/npKqioWnHB7BEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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