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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847715ce6ccb9bec776aecfede7b8e0604f2e5fd090c5007aeae3b71dd6219d5' 
  AND token = '41jLXTXwgh93QjoP6WQ9l3t4IJrRe6aBIJ60SLu7QTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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