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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db590ea3f19afc4e26865757229788f758b99900a3b811c96241dc1771565fd' 
  AND token = 'r2RKX72edozoHTo51eyUPOuSfSxAWiRrhpP+9nOQZjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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