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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bd633b3ef7a0a0cc48969e81d059ad750df7b0ae8baee1e1923c77efe456e6' 
  AND token = 'Kh35PaAre1hXJACGCwiIA3hcfKlo//QUBsodb9izLkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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