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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bce9491c47f7984b0bc7f714fe30f1755307d608faa314baf5e504aa9a289d' 
  AND token = 'v14t1RJ/pytky67ac3j5LufS9bRpVRpRA9wYcZiyJ4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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