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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf9e0c988c9dbaf44118026752d0b9f5d140259ca16b5e5cbfacc70273ffdb4' 
  AND token = 'aOSssGxa7pM5mJXhjHmRCLJnXN5bZMMJNvrloElmaOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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