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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09dfced96a1c52bfb6b7f4f0ff018f5d3dbe4a914b79f9312d26948e063decfd' 
  AND token = 'Ze/jeXyOZwgFoJt9Y1VpFGkRyxiZ5BfARhGP+JSdY9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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