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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357322cbda667c711b960fac55339b7b92654cef4b35a2051f6ee61f2321c002' 
  AND token = 'CSeBHAP/9xLNOJN/b0UJi/xeesgHgiNwUdD5o5MCfSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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