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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5272e5fbfca45e26c85c57a1e8fff1931439439f363b080861d47ad8194ac9f3' 
  AND token = 'yK09ydE281awAqsXu7Vb1r3RY7l7f21gv8ELmnAMPsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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