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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaaa33013127cd77663bb2eabfc88f8f80bee78a816a3be81fb9b6c1da525ca8' 
  AND token = 'C9mgWuv3z5ivgzUwCEDCXbuSuB3T2Y+tZkYoHCbUV+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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