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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3831d8a97b13642aebdc8db042ec2df04dde33521eb3b0bf276c50245829fcbc' 
  AND token = 'pemjap+5mp+p3fNR6CaAlqCxPKnwQcHYu1m6gO77dZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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