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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02fcdf19ecbe43e56a35a551c9d93eac2356b5182801e4ef39d14b0f464180b' 
  AND token = 'hHEQ7ENvMEyFj4sBE7B/b7Med5DM9KmUjWBZC96OwnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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