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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038e86327c2e8825e3e3f3179b77db39428a539e5e51fcc4e18a80a12e717ac6' 
  AND token = '7aJ6Sh9GpOjg4P8DmmX8as4eNZoSp9vA5K3ytYqHXNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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