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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf3579fed2b0249f9ec0067027c87bcf41a74ee4be3582c7c6b72bd04ae4237' 
  AND token = 'ZLybMwufSecZHIEmvhdGnpx+snNkx1XyUJGTXvgUtj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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