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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158daae717d32780aaf04412a4f0cabe0d09a893ece30bcbfaf5621cf3d9a3ee' 
  AND token = '7lM9D3ByVxrZMOTaff3noek9I6yeAFbkKWXerYENu4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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