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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0661cc08fec38ec6faa71505005aed7cd044b615eab72e8466b10b6c0e0fe29d' 
  AND token = 'Gx/0sW08bOQcQ22IIhIOd0AuYViPedjXHWq4kH385V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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