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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb92c52f0af41c14d814cbb0a8653402a57d2114c332953d9797e104bbd7d2e0' 
  AND token = 'ayxHPC45KDmgjiDoE7HJjb7LykZEv6YFIJUJoQ8mFwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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