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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '044a6bdf23973d11d406f481f3ee72d56ac383c482fe933612dcb39926bb7a7a' 
  AND token = 'IWHy1gTRtXemM7BZlPMY5e1TBxZQ478FZznOB6SGRxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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