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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40495b4c8556d930f10bbc4624e2db83fc5bad6ef3244a26756a16c096ddec1f' 
  AND token = 'Zn85Nhe2sQN015M43xtZVtnEd8pPEoqatjcwuA61CMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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