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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ce0bc2c4e7287d2101ddeed6bfb837760f57ab5e6e9b4ecb0dca9b8f0547d6' 
  AND token = 'bxk7ubzQZ+BT31YieqEGj+yOncKKgORYKzRYYEktktY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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